Submission #894843

#	Time	Username	Problem	Language	Result	Execution time	Memory
894843		Faisal_Saqib	Fountain Parks (IOI21_parks)	C++17	0 / 100	1 ms	512 KiB

parks

#include <vector>
#include <map>
#include <queue>
using namespace std;
void build(std::vector<int> u, std::vector<int> v, std::vector<int> a, std::vector<int> b);
int construct_roads(std::vector<int> x, std::vector<int> y)
{
	int n=x.size();
	vector<int> u,v,a,b;
	map<pair<int,int>,int> ind;
	for(int i=0;i<n;i++)
		ind[{x[i],y[i]}]=1;
	map<int,bool> vis;
	queue<pair<int,int>> q;
	q.push({x[0],y[0]});
	while(q.size())
	{
		auto f=q.front();
		q.pop();
		if(ind.find({f.first,f.second+2})!=ind.end() and !vis[ind[{f.first,f.second+2}]])
		{
			vis[ind[{f.first,f.second+2}]]=1;
			u.push_back(ind[f]);
			v.push_back(ind[{f.first,f.second+2}]);
			if(f.first==2)
			{
				a.push_back(f.first-1);
				b.push_back(f.second+1);
			}
			else// 4
			{
				a.push_back(f.first+1);
				b.push_back(f.second+1);
			}
			q.push({f.first,f.second+2});
		}
		if(ind.find({f.first+2,f.second})!=ind.end() and !vis[ind[{f.first+2,f.second}]])
		{
			vis[ind[{f.first+2,f.second}]]=1;
			u.push_back(ind[f]);
			v.push_back(ind[{f.first+2,f.second}]);
			a.push_back(f.first+1);
			b.push_back(f.second+1);
			q.push({f.first+2,f.second});
		}
	}
	if(vis.size()!=n)
		return 0;
	build(u,v,a,b);
	return 1;
}

Compilation message (stderr)

parks.cpp: In function 'int construct_roads(std::vector<int>, std::vector<int>)':
parks.cpp:47:15: warning: comparison of integer expressions of different signedness: 'std::map<int, bool>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   47 |  if(vis.size()!=n)
      |     ~~~~~~~~~~^~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 10
• Subtask 3: 0 / 15
• Subtask 4: 0 / 20
• Subtask 5: 0 / 20
• Subtask 6: 0 / 30